NH_userscript

Wrappers for dealing with variations in userscript managers.
目前為 2023-11-05 提交的版本，檢視最新版本。
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/478349/1275719/NH_userscript.js
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// ==UserScript==
// ==UserLibrary==
// @name        NH_userscript
// @description Wrappers for dealing with variations in userscript managers.
// @version     4
// @license     GPL-3.0-or-later; https://www.gnu.org/licenses/gpl-3.0-standalone.html
// @homepageURL https://github.com/nexushoratio/userscripts
// @supportURL  https://github.com/nexushoratio/userscripts/issues
// @match       https://www.example.com/*
// ==/UserLibrary==
// ==/UserScript==
 
window.NexusHoratio ??= {};
 
window.NexusHoratio.userscript = (function userscript() {
  'use strict';
 
  /** @type {number} - Bumped per release. */
  const version = 4;
 
  /** Library specific exception. */
  class UserscriptError extends Error {
 
    /** @inheritdoc */
    constructor(...rest) {
      super(...rest);
      this.name = this.constructor.name;
    }
 
  }
 
  /**
   * @typedef LicenseData
   * @property {string} name - License name.
   * @property {string} url - URL pointing to the license.
   */
 
  /**
   * Per the *old* GM docs:
   * https://sourceforge.net/p/greasemonkey/wiki/Metadata_Block/#license
   * @returns {LicenseData} - Extracted from the userscript header.
   * @throws {Error} - If cannot be extracted.
   */
  function licenseData() {
    let license = GM.info.script.license;
    if (!license) {
      const magic = '// @license ';
 
      // Try a legacy way
      const header = GM.info.scriptMetaStr;
      if (header) {
        const line = header.split('\n').find(l => l.startsWith(magic));
        if (line) {
          license = line.slice(magic.length).trim();
        }
      }
    }
 
    if (!license) {
      const msg = [
        'Unable to extract license information from the userscript.',
        // eslint-disable-next-line no-magic-numbers
        JSON.stringify(GM.info, null, 2),
      ].join('\n');
      throw new UserscriptError(msg);
    }
 
    const [name, url] = license.split(';');
 
    return {
      name: name.trim(),
      url: url.trim(),
    };
  }
 
  /** @returns {string[]} - Raw text about the current environment. */
  function environmentData() {
    const gm = GM.info;
    const msgs = [`${gm.script.name}: ${gm.script.version}`];
    msgs.push('NexusHoratio libraries:');
    for (const [lib, obj] of Object.entries(window.NexusHoratio)) {
      if (Object.hasOwn(obj, 'version')) {
        msgs.push(`  ${lib}: ${obj.version}`);
      } else {
        msgs.push(`  ${lib}: Unknown version`);
      }
    }
 
    msgs.push(`Userscript manager: ${gm.scriptHandler} ${gm.version}`);
 
    if (gm.injectInto) {
      msgs.push(`  injected into "${gm.injectInto}"`);
    }
 
    // Violentmonkey
    if (gm.platform) {
      msgs.push(`Platform: ${gm.platform.browserName} ` +
                `${gm.platform.browserVersion} ${gm.platform.os} ` +
                `${gm.platform.arch}`);
    }
 
    // Tampermonkey
    if (gm.userAgentData) {
      let msg = 'Platform: ';
      for (const brand of gm.userAgentData.brands.values()) {
        msg += `${brand.brand} ${brand.version} `;
      }
      msg += `${gm.userAgentData?.platform} `;
      msg +=
        `${gm.userAgentData?.architecture}-${gm.userAgentData?.bitness}`;
      msgs.push(msg);
    }
    return msgs;
  }
 
  /**
   * Fetches value from userscript storage if granted.
   *
   * Purposefully no errors if permissions are not granted
   *
   * @param {string} key - The name of the value to load.
   * @param {*} defaultValue - Value if not stored OR not enabled.
   * @returns {Promise<*>} - The value fetched or defaultValue.
   */
  function getValue(key, defaultValue) {
    if (GM.getValue) {
      return GM.getValue(key, defaultValue);
    }
    return Promise.resolve(defaultValue);
  }
 
  /**
   * Sets a value in userscript storage if granted.
   *
   * Purposefully no errors if permissions are not granted
   *
   * @param {string} key - The name to use in the storage.
   * @param {*} value - The value to set.
   * @returns {Promise<*>} - Always resolves to null; mostly used to ensure
   * the write is complete.
   */
  function setValue(key, value) {
    if (GM.setValue) {
      return GM.setValue(key, value);
    }
    return Promise.resolve(null);
  }
 
  return {
    version: version,
    UserscriptError: UserscriptError,
    licenseData: licenseData,
    environmentData: environmentData,
    getValue: getValue,
    setValue: setValue,
  };
 
}());
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